NC-Eas(Y) may open an .nc file in read-only mode and prevent optimization edits when its file-size editing limit is involved. The confirmed workaround is to increase the option labeled “Allow editing of files up to size ... Mbyte” under the file options.
Identify the read-only condition
The reported message states that the file cannot be edited in read mode and directs the operator to Settings, Options, and then Files. The relevant control is not explicitly labeled as a read-mode setting; it is the maximum file size permitted for editing.
Increase the editing size limit
- Open Settings and then Options.
- Select the Files section.
- Locate Allow editing of files up to size ... Mbyte.
- Increase the configured limit. In the reported case, changing it from 15 Mbyte to 500 Mbyte restored editing.
- Reopen the .nc file and confirm that editing commands are available.
Interpret the reported size mismatch
| Item | Reported value |
|---|---|
| .nc file size | 7-point-something MB |
| Original editing limit | 15 Mbyte |
| Working editing limit | 500 Mbyte |
The reported file size was already below the original 15 Mbyte setting, so the available evidence does not explain why that limit triggered read-only behavior. Treat the size-limit change as a confirmed workaround, not proof of the underlying calculation or software behavior.
Verify the correction
Close and reopen the same .nc file after changing the limit. The correction is verified only when NC-Eas(Y) permits an actual edit and the file no longer behaves as read-only. If increasing the limit does not restore editing, the evidence provides no confirmed secondary cause; record the file size, configured limit, and exact message for further diagnosis.
FAQ
Why does NC-Eas(Y) open my .nc file in read-only mode?
The confirmed case was resolved by increasing the maximum file size allowed for editing under Settings, Options, and Files.
Where is the NC-Eas(Y) read-mode option?
No separate read-mode control was identified. Use the Files option labeled “Allow editing of files up to size ... Mbyte.”
What file-size limit fixed the NC-Eas(Y) editing error?
Changing the limit from 15 Mbyte to 500 Mbyte restored editing in the reported case, although the affected file was only 7-point-something MB.
